drm/i915: Disable the cursor for DPMS_OFF

The comments have long desired that we should switch off the cursor
along with the display plane, make it so.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Eric Anholt <eric@anholt.net>

drivers/gpu/drm/i915/intel_display.c

@@ -2470,9 +2470,6 @@ static void i9xx_crtc_dpms(struct drm_crtc *crtc, int mode)
 
 /**
  * Sets the power management mode of the pipe and plane.
- *
- * This code should probably grow support for turning the cursor off and back
- * on appropriately at the same time as we're turning the pipe off/on.
  */
 static void intel_crtc_dpms(struct drm_crtc *crtc, int mode)
 {
@@ -2487,6 +2484,9 @@ static void intel_crtc_dpms(struct drm_crtc *crtc, int mode)
 
 	intel_crtc->dpms_mode = mode;
 
+	intel_crtc->cursor_on = mode == DRM_MODE_DPMS_ON;
+	intel_crtc_update_cursor(crtc);
+
 	if (!dev->primary->master)
 		return;
 
@@ -4242,7 +4242,7 @@ static void intel_crtc_update_cursor(struct drm_crtc *crtc)
 
 	pos = 0;
 
-	if (crtc->fb) {
+	if (intel_crtc->cursor_on && crtc->fb) {
 		base = intel_crtc->cursor_addr;
 		if (x > (int) crtc->fb->width)
 			base = 0;

drivers/gpu/drm/i915/intel_drv.h

@@ -154,7 +154,7 @@ struct intel_crtc {
 	uint32_t cursor_addr;
 	int16_t cursor_x, cursor_y;
 	int16_t cursor_width, cursor_height;
-	bool cursor_visble;
+	bool cursor_visble, cursor_on;
 };
 
 #define to_intel_crtc(x) container_of(x, struct intel_crtc, base)